It was not proper for the people of Madinah and those round about them of the desert Arabs to remain behind the Messenger of Allah, nor to prefer their own lives to his life. That is because there afflicts them neither thirst nor fatigue nor hunger in Allah’s way, nor tread they a path which enrages the disbelievers, nor cause they any harm to an enemy, but a good work is written down for them on account of it. Surely Allah wastes not the reward of the doers of good.